. Author manuscript; available in PMC: 2021 Apr 1.

Published in final edited form as: Early Interv Psychiatry. 2019 Jul 2;14(2):211–219. doi: 10.1111/eip.12848

Table 2.

Within and Between Period Changes in Anxiety, Emotion Regulation, Mindfulness and Clinical Severity in the Waitlist and Treatment Periods

Variable	Baseline M (± SD) ^†	Endpoint M (±SD) ^†	Within period p-value	Within period effect size	Between period change (95% CI) ^‡	Between period effect size	Between period p-value
Clinician-rated anxiety (PARS)
Waitlist	12.1±4.5	9.6±4.4	0.12	−.23	−1.6 (−7.3, 4.0)	−0.08	0.56
MBCT-C	9.6±4.4	5.6±5.7	0.01	−.36	−1.6 (−7.3, 4.0)	−0.08	0.56
Child-rated state anxiety (STAI)
Waitlist	34.4±7.1	34.1±6.9	0.89	−.02	0.7 (−7.2, 8.6)	0.03	0.86
MBCT-C	34.1±6.9	34.6±9.0	0.87	.02
Child-rated trait anxiety (STAI)
Waitlist	40.8±9.7	37.8±10.2	0.10	−.62	−2.7 (−8.4, 2.9)	−0.36	0.32
MBCT-C	37.8±10.2	31.2±10.2	<0.01	−1.19	−2.7 (−8.4, 2.9)	−0.36	0.32
Emotional lability (ERC)
Waitlist	31.8±6.2	29.7±6.6	0.45	−.17	−0.9 (−7.8, 6.1)	−0.06	0.81
MBCT-C	29.7±6.6	28.5±6.1	0.34	−.22	−0.9 (−7.8, 6.1)	−0.06	0.81
Emotion regulation (ERC)
Waitlist	23.8±4.7	24.3±4.6	0.61	.12	−1.0 (−6.0, 4.0)	−0.09	0.69
MBCT-C	24.3±4.6	23.8±5.3	0.85	−.04	−1.0 (−6.0, 4.0)	−0.09	0.69
Mindfulness (CAMM)
Waitlist	20.9±9.9	24.6±9.0	<0.01	.58	−1.9 (−7.9, 4.1)	−0.13	0.54
MBCT-C	24.6±9.0	27.2±10.1	0.39	.19	−1.9 (−7.9, 4.1)	−0.13	0.54
Clinical global severity (CGI-S)
Waitlist	3.3±.8.0	3.4±1.0	0.92	−.01	−1.0 (−2.1, 0.0)	−0.29	0.05
MBCT-C	3.4±1.0	2.3±1.2	<0.01	−.44	−1.0 (−2.1, 0.0)	−0.29	0.05

Note.

^†

Endpoint in the waitlist period = baseline in the MBCT-C period.

^‡

MBCT-C (week 12 - week 0) - Waitlist (week 12- week 0); negative values indicate greater reductions in MBCT-C period as compared to the Waitlist period. PARS: Pediatric Anxiety Rating Scale; STAI: State-Trait Anxiety Inventory; ERC: Emotion Regulation Checklist; CAMM: Child and Adolescent Mindfulness Measure; CGI-S: Clinical Global Impression-Severity.